Are you seeing these in your About Phone , software information then service provider information ?
I purchased my Fold 3 direct from Samsung UK.
It has the EUX csc code on it for the UK.
The other unlocked CsC for the UK is BTU.
If you download the phoneINFO app from the Playstore this will better highlight the active CsC and other information about your phone.
Can you then screenshot the CsC code page and upload that into your thread here.
I've had a search for those two CsC your asking about but as of yet haven't found the answer.
Who supplied the phone to you ?
Is your phone working Ok ? I ask as your questioning the CsC code on the phone.
If you go into your Samsung Members app and tap on Benefits does various benefits show or is this blank ?
Below is a list of sources for CsC codes.
If you Google Search for ' BTB or BTE firmware ' this would lead you to sites such sammobile.com as this is connected to flashing firmware on a phone which should only be performed if your clear about the process and the possibilities of an unstable phone as a possible outcome.
Samsung Customer services should be able to clarify if you contact them via Live Chat or phone in regards to the status of your phone.
Would you please update your thread with any relevant information you discover.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.